Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Des Moines, IA

June 18, 20214 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2021, 11:22 PM CDT for 4 counties in Iowa. It was in force for 53 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jun 18, 2021, 11:22 PM CDT (04:22 UTC)
Expired
Jun 19, 2021, 12:15 AM CDT
In force
53 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Appanoose County, IA, Davis County, IA, Monroe County, IA, Wapello County, IA

The radar

The Des Moines radar (KDMX), 138 km from the middle of the area, began a volume at 04:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jun 18, 11:56 PM CDTTSTM WND DMGBlakesburg, IABLAKESBURG FIRE DEPARTMENT REPORTING HEAVY TREE DAMAGE AND SOME DAMAGE TO HOMES AS IN SOFFITS TORE OFF.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 18, 10:08 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.4 hours before the alert went out and 190 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2021-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2021-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
4 J/kg
Mixed-layer CIN
-335 J/kg
Mixed-layer LCL
2572 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS53 KDMX 190422
SVRDMX
IAC007-051-135-179-190515-
/O.NEW.KDMX.SV.W.0020.210619T0422Z-210619T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1122 PM CDT Fri Jun 18 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Eastern Monroe County in south central Iowa...
  Davis County in southeastern Iowa...
  Southern Wapello County in southeastern Iowa...
  Northeastern Appanoose County in south central Iowa...

* Until 1215 AM CDT.

* At 1122 PM CDT, a severe thunderstorm was located near Albia,
  moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Bloomfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4092 9288 4115 9270 4098 9218 4060 9218
      4059 9243
TIME...MOT...LOC 0422Z 300DEG 25KT 4098 9270 

HAIL...1.25IN
WIND...60MPH
 
$$

Martin
1 follow-up statement
767 
WWUS53 KDMX 190457
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1157 PM CDT Fri Jun 18 2021

IAC007-051-135-179-190515-
/O.CON.KDMX.SV.W.0020.000000T0000Z-210619T0515Z/
Monroe IA-Davis IA-Wapello IA-Appanoose IA-
1157 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR EASTERN MONROE...DAVIS...SOUTHERN WAPELLO AND NORTHEASTERN
APPANOOSE COUNTIES...

At 1156 PM CDT, a severe thunderstorm was located 7 miles north of 
Bloomfield, moving southeast at 30 mph. Emergency management 
reported heavy tree damage and some damage to homes in Blakesburg. 

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Emergency management.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Ottumwa, Albia, Bloomfield, Lake Sundown, Eldon, Moravia, Agency,
Blakesburg, Pulaski, Drakesville, Floris, Unionville, Chillicothe,
Albia Municipal Airport, Lake Wapello State Park and Bloomfield
Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4092 9288 4115 9270 4098 9218 4060 9218
      4059 9243
TIME...MOT...LOC 0456Z 300DEG 25KT 4086 9242 

HAIL...1.00IN
WIND...70MPH
 
$$

Martin

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 18, 9:56 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Madison, Marion, Warren49 min
Jun 18, 10:06 PM CDTSevere Thunderstorm WarningDMXAdair, Clarke, Madison, Union39 min
Jun 18, 10:39 PM CDTSevere Thunderstorm WarningDMXLucas, Monroe, Wayne51 min
Jun 18, 10:43 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Madison, Union, Warren47 min
Jun 18, 10:45 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Monroe, Wapello45 min
Jun 18, 10:54 PM CDTSevere Thunderstorm WarningDMXAdair, Cass51 min
Jun 18, 11:05 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion25 min
Jun 18, 11:10 PM CDTSevere Thunderstorm WarningDMXAppanoose, Lucas, Monroe, Wayne50 min
Jun 18, 11:14 PM CDTSevere Thunderstorm WarningDMXAdair, Madison46 min
Jun 18, 11:19 PM CDTSevere Thunderstorm WarningDMXMahaska26 min
Jun 18, 11:25 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Lucas, Wayne50 min
Jun 18, 11:32 PM CDTSevere Thunderstorm WarningDMXCass28 min
Jun 18, 11:37 PM CDTSevere Thunderstorm WarningDMXAdair, Adams, Union53 min
Jun 18, 11:54 PM CDTSevere Thunderstorm WarningDMXClarke, Madison, Warren36 min
Jun 18, 11:55 PM CDTSevere Thunderstorm WarningDMXAppanoose, Lucas, Monroe, Wayne50 min
Jun 18, 11:59 PM CDTSevere Thunderstorm WarningDMXAdair, Adams, Clarke, Madison, Ringgold, Union46 min
Jun 19, 12:13 AM CDTSevere Thunderstorm WarningDMXAdams26 min
Jun 19, 12:14 AM CDTSevere Thunderstorm WarningDMXDavis, Wapello31 min
Jun 19, 12:25 AM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Marion, Warren35 min
Jun 19, 12:29 AM CDTSevere Thunderstorm WarningDMXAppanoose, Davis46 min
Jun 19, 12:44 AM CDTSevere Thunderstorm WarningDMXLucas, Marion, Monroe31 min
Jun 19, 3:59 AM CDTSpecial Weather StatementDMXDavis46 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.